c# - Listbox in asp.net not getting selected items -

i have multiple dropdown & listbox in webpage.

i trying list of categoryid lstcatid listbox able populate listbox category name.

if remember correctly in first attempt code worked fine, after made change stated first item selected x no. of time

<asp:listbox id="lstcatid" runat="server" datatextfield="categoryname"                  datavaluefield="categoryid" selectionmode="multiple" cssclass="lstlistbox">  </asp:listbox>    protected void button1_click(object sender, eventargs e) {     string catid = string.empty;     foreach (listitem li in lstcatid.items)     {         if (li.selected == true)         {            // response.write();             catid += lstcatid.selecteditem.value + ",";         }     }     response.write(catid); } 

i not sure going wrong checkd msdn show same way of doing it.

may doing wrong.

just add using firefox able see multiple selected value have selected property.

<option value="3" selected="selected">one</option> <option value="2">two</option> <option value="29" selected="selected">three</option> <option value="25" selected="selected">four</option> <option value="22" >five</option> 

my output in case 3,3,3

i appreciate in regard

you setting same value every time:

foreach (listitem li in lstcatid.items) {     if (li.selected == true)     {        // using lstcatid.selecteditem.value.         catid += lstcatid.selecteditem.value + ",";     } } 

when want value of item in loop selected:

foreach (listitem li in lstcatid.items) {     if (li.selected == true)     {         // value of item in loop         catid += li.value + ",";     } }